Disable third-party cookies in Firefox to stop some types of tracking by advertisers

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Third-party cookies are cookies that are set by a website other than the one you are currently on. For example, cnn.com might have a Facebook like button on their site. That like button will set a cookie that can be read by Facebook. That would be considered a third-party cookie.

Some advertisers use these types of cookies to track your visits to the various websites on which they advertise. If you are concerned about this, you can disable third-party cookies in Firefox.

Disabling third-party cookies in Firefox can stop some types of tracking by advertisers, but not all.

Some websites (for instance, Microsoft's Hotmail, MSN, and Windows Live Mail webmail) use third-party cookies for purposes that are not necessarily privacy concerns, and disabling third-party cookies may cause problems with those sites.

Select the PrivacyPrivacy & Security panel and go to the History section.

In the drop-down menu next to Firefox will:Firefox will choose Use custom settings for history.

In the drop-down menu next to Accept third-party cookies choose Never.

Note: If after browsing with this setting, you realize you can't view properly some of your favorite websites, an intermediate solution is to set it to From Visited that allow third-party cookies coming from previously visited websites.

Close the about:preferences page. Any changes you've made will automatically be saved.